Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
98.9
99
99
98
100
100
February
97.9
99
99
99
93
100
March
96.7
100
98
93
96
96
April
99.1
100
99
100
99
99
May
99.0
98
99
99
100
100
June
99.6
100
99
100
99
100
July
99.7
100
100
100
100
100
August
99.8
100
100
100
100
100
September
99.4
99
100
99
100
October
98.2
99
97
99
99
November
96.8
98
100
95
98
December
99.1
99
99
100
98
Average
98.8
99.3
98.9
98.6
98.4
99.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
13.1
14
14
13
13
14
February
13.9
16
13
14
14
15
March
15.4
17
16
13
14
15
April
17.9
20
17
18
16
17
May
22.0
23
21
24
22
22
June
26.8
28
26
28
27
25
July
29.5
31
31
30
30
28
August
29.6
31
29
29
31
30
September
26.6
27
27
26
27
October
22.1
24
22
21
21
November
18.6
19
18
19
18
December
15.0
15
17
14
15
Average
20.6
22.5
21.0
21.1
20.7
20.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
6.9
8
8
7
7
8
February
7.4
9
6
7
8
8
March
8.4
10
9
7
8
8
April
10.9
12
10
10
9
11
May
15.6
16
16
16
15
17
June
20.3
21
20
21
19
20
July
22.7
24
23
23
23
21
August
23.3
25
23
23
23
23
September
20.3
21
20
20
21
October
15.7
17
17
15
14
November
12.6
12
12
13
13
December
9.1
9
12
8
9
Average
14.9
15.6
14.4
14.6
14.0
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
7
12
5
10
2
February
6.6
5
2
6
10
7
March
7.1
6
7
8
9
4
April
5.4
8
9
3
4
5
May
4.2
2
9
2
1
3
June
1.8
1
5
2
0
3
July
0.8
1
0
1
0
1
August
0.7
1
1
1
0
1
September
1.8
1
6
2
1
October
4.8
3
4
6
6
November
7.7
8
8
5
6
December
6.6
6
15
5
6
Average
4.1
3.5
5.0
4.2
3.9
3.2
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
10.7
11
10
12
10
11
February
11.1
10
11
11
10
11
March
10.4
10
10
10
11
10
April
9.7
9
10
11
11
9
May
9.1
9
9
8
11
11
June
8.9
9
9
9
8
9
July
9.4
10
9
9
9
10
August
9.5
10
10
10
9
9
September
9.7
11
10
8
10
October
9.1
9
9
9
9
November
9.3
10
9
9
9
December
10.0
9
9
11
9
Average
9.7
9.7
9.6
9.7
9.6
9.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
354°
297°
001°
264°
328°
February
223°
360°
346°
337°
315°
March
212°
286°
016°
345°
323°
April
322°
345°
327°
327°
001°
May
049°
313°
032°
311°
294°
June
345°
345°
350°
356°
349°
July
353°
344°
355°
351°
346°
August
352°
335°
348°
357°
345°
September
008°
306°
005°
336°
October
303°
350°
357°
302°
November
252°
348°
207°
360°
December
321°
193°
334°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.